Meaning and Name Origin
Ethelbert \e-thelbe-rt, eth(el)-bert\ as a boys' name is of Old English origin, and the meaning of Ethelbert is "noble, bright". The original form Aethelbert or Aethelbeorht, formed from aethel meaning "noble" and berht meaning "bright, famous", and thus the Old English equivalent of Albert. The name of three Anglo-Saxon kings, two of whom became saints: Saint Ethelbert of Kent whom Saint Augustine converted to Christianity, and Saint Ethelbert of the East Angles to whom Hereford Cathedral is dedicated.
For more information, see also the related boy name Elbert.
Ethelbert has 24 more different forms via Albert: Abert, Adalbert, Adalberto▼, Adalbrecht, Adelbert▼, Adelbrecht, Ailbert, Al▼, Albertino, Alberto▲, Albertus, Albie, Albrecht, Albrekt, Allie▼, Alvert, Alvertos, Aubert, Berty, Dalbert, Delbert▼, Elbert▼, Elbrecht and Ulbricht.
Ethelbert has 1 feminine form: Ethelberta.
Ethelbert is a rare given name for men. Ethelbert is an equivalently rare last name too for both adults and children. (2000 U.S. Census)
Below is a charted analysis of the usage of Ethelbert and related names. Adalberto, Adelbert, Al, Albert (#436 a year ago), Alberto (#513), Allie, Bert, Bertie, Delbert and Elbert are the popular varying forms of Ethelbert (#unlisted). These boy names reached the top of their popularity during 1880-1889 and have become significantly less popular since, with forms such as Albert, Bert, Bertie, Delbert and Elbert falling out of fashion. Alberto (#513) is the most fashionable boy name in this list. (Top 1000 Baby Names Statistics, 2014)